hi guys i have a 1987 cherokee pioneer i bought a few weeks ago. I was told by the owner that all it needed was a tcm, as the tranny would shift up and down while cruisin at speed gson level ground. i finally tracked one down and installed it, no problem. i went on a test drive with no problems. i got back and i took this as an opportunity to go ahead and to a basic tune up on it. i replaced plugs, wired dist cap and rotor. it started and ran. i killed it, went in to wash up and when icame back out, nothing. i turn the ignition and the fuelpump whirrs in the back but theres nothing at all up front. eventually ifound that the 10 amp in line fuse next to the tcm was blown, i replaced it and 5 consecutive times later it blew each replacement when i turned the key to the power position.

still combining the electrics, but i would appreciate any help

 

Update

I recently replaced my tcm on my 87 Cherokee pioneer L6. Because it was shifting up and down while cruising on level ground. Now I'll admit what I did next was stupid and irresponsible, I removed the in-line fuse on the blue wire with the yellow stripe that connected to the yellow wire. My brilliant idea was that "hey when this thing pops I don't want to have to go looking for it" but you know what? It was there for a reason, who knew? So I had to replace the black wire that that line eventually gets to in the direction opposite the tcm cuz it boiled its casing and the jeep wouldn't start. That done, it now starts but drive feels like when you go to second instead of fourth on a manual. Low 2 will take off like it used to but won't shift, switching to higher drive gears seems to work at speed. And I don't think it's the tcm because I hooked the old one back up and same problem, it did at least shift properly during acceleration before.